Microplastics in blood linked to higher risk of heart attacks

New research published on Wednesday, 15 July 2026, in the European Heart Journal has identified a strong association between the presence of microplastics in the blood and a heightened risk of acute cardiovascular events. While microplastics — tiny particles resulting from the breakdown of consumer goods — have been previously identified in human organs and tissues, this study is among the first to measure their presence directly within the coronary circulation, the blood supply critical to heart function.

Researchers examined 61 patients who underwent coronary angiography. The participants were categorized into three groups: those recovering from a recent heart attack, those with chronic ischemic heart disease, and a control group with normal coronary arteries. The findings revealed a clear gradient: 84% of heart attack patients had detectable microplastics in their blood, compared to 40% of patients with chronic disease and 32% of individuals with normal arteries. Furthermore, those who had suffered a heart attack possessed a wider variety of plastic polymers, with polyethylene being the most frequently identified substance, according to research from the European Society of Cardiology.

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Potential Mechanisms and Environmental Links

The study, led by Dr. Pasquale Paolisso and Professor Emanuele Barbato of Sant’Andrea University Hospital and Sapienza University of Rome, suggests that environmental factors play a significant role in how these materials enter the human body. Data indicated that smoking and exposure to high levels of air pollution were strongly linked to elevated concentrations of plastic particles in the blood. Specifically, smokers were six times more likely to have detectable microplastics in their system than non-smokers.

"When we looked at patients who both smoked and lived with higher levels of air pollution, every single one of them had detectable microplastics—100%—whereas among those who neither smoked nor were heavily exposed, only about one in eight did."

Dr. Emanuele Barbato and Dr. Pasquale Paolisso, via Time

Experts hypothesize that cigarette smoke and air pollution may act as vectors. The fine particulate matter found in smoke and smog may allow microplastics to penetrate the deep tissue of the lungs, specifically the alveoli, facilitating their entry into the bloodstream. This observation aligns with the concept of the "exposome," which considers how an individual's cumulative lifetime exposure to environmental pollutants shapes overall Health, as reported by The Conversation.

Context and Clinical Caution

This work follows a 2024 study that detected microplastics within atherosclerotic plaques, the fatty deposits that clog arteries. That research, published in The New England Journal of Medicine, found that patients with plastic-containing plaques faced a 4.5 times higher risk of heart attack, stroke, or death over a three-year period. However, clinicians urge caution, noting that observational studies cannot confirm direct causality. Factors such as inflammation, which was found to be elevated in patients with microplastics in their blood, remain a central focus for future investigation, as inflammation is known to destabilize arterial blockages.

Other experts, such as Thava Palanisami of the University of Newcastle, emphasize that distinguishing between the effects of the plastic particles themselves and the chemical toxins they may carry remains a significant technical challenge. As noted by EL PAÍS, the researchers themselves define their current findings as "hypothesis-generating" rather than definitive proof of cause.

Comparative Prevalence of Microplastics by Patient Group

What to Watch Next

Moving forward, the medical community identifies several priorities for this area of Health research:

• Development of Testing: There is currently no widely available clinical test to measure individual plastic exposure, with current methods limited to laboratory research.
• Refining Detection: Researchers are calling for more precise analytical methods to determine how these particles interact with biological systems at the cellular level.
• Policy Advocacy: Cardiologists are increasingly suggesting that reducing exposure to environmental contaminants, including smoking, air pollution, and plastic usage, should be viewed as a essential component of maintaining heart health alongside traditional measures like monitoring cholesterol and blood pressure.

While the long-term impact of these particles remains under investigation, the Harvard Health perspective maintains that protecting the heart continues to depend on managing established risks like hypertension and dyslipidemia, even as the understanding of environmental pollutants evolves.